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Question

Magnification produced by a convex mirror is 13, then distance of the object from mirror is

A
f3
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B
2f3
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C
1f
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D
2f
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Solution

The correct option is D 2f
1f=1v1u, multiply using by u
uf=uvuu=uv1
uf+1=uvuv=u+ff
vu=ff+um|vu|=ff+u
given that m=13
So 13=ff+uf+u=3f
u=2f

1181988_872952_ans_6f53e156a2cc4a3d8dff2f0ed1976e97.jpg

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